Drink mixer



Sept; 1l, 1934. H.w. MILLER K- 1,973,091

` DRINK MIXER Filed sept. 22, '19:52 s 'sheets-sheet. 1

' INVENTOR. M11/.4,60 W/V/Lze Y "ATTORNEYl .H. W. MILLER sept. 11, 1934.

DRINK MIXER Filed Sept. 22, 1932 3 Sheets-Sheet 3 INVENTOR.

aff/geo M//W/Lls BY Z ATTORNEY.

Patented Sept. 11, 1934 U'Nrra-. STATES :PATENT I' '1,973,091 DRINK MIXER Howard W. Miller, Wausau, Wis. y Application' septemberaz, 193.2, serial No. 634,313

12 claims.. (c1. 259-99) Y My invention relates to improvements in drink lmixers of the kind used at the soda fountains for mixing beverages such as malted milk and the like.

5 `The main object of my invention is to provide a mixer of this kind in whichthe driving motor is pivot-ally supported in a suitable stand and is arranged to be automatically started as it is swung inward in the processV of placing themixing re- '10 ceptacle o r can beneath the motor for mixing the drink, the motor then being automatically shut v@if after it has run for a period of time suflicient to thoroughly mix the drink. v

Another and important object is to provide a machine of this kind in which the agitator element as it is rotated by the motor also move's'upward and downward in and through the drink to effect amore complete mixture thereof.

Another object is-to lprovide a machine of this kind in which the agitator element is attached to the receptacle orvcan and is removable or detachable from the lmotor whereby it will be yreadily cleaned each time the receptacle is cleanedffor further use. f 1,

A further object is to provide a machine of this kind in an ecient, durable and. relatively simple form. 1 f

' With these and other obj ects in View the invenf tion resides in the novel. construction and. ar,-

rangement ofv parts as hereinafter set forth and claimed, reference being had tothe accompanying-drawings wherein: Figure 1 is a side view of -the drink mixer showing a drink-receptacle in position for use. Figure.2 is an enlarged vertical vand media cross section through the motor, housing and-associated parts. f 4Figure 3 is ahorizontal section along the line 3--3 in Figure 2.. l f .t

Figure 4 isa view ytaken along the line 4+4 'in Figure 3,l Figure 5 is a vhorizontal section'alongthe-line 5-5inlzlgure2.y l v Figure 6 is an enlarged cross section through the upper part of the agitator operating sleeve.

Figure '7 is an 'enlarged horizontal section through the agitator carrier showing the raising and lowering wings or pawls. Y

.Figure 8 is an enlarged end elevation of one of the Wings or'pawls alone. f

Figure 9 is a detached elevation of the agitator carrierguide.- y Y:

Figure 10 is a `fragrnental'enlarged side elevation showing the pivotal connection betweenv the stand and motor housing a part being broken away and shown in section. .1 f Figure 1'1 is an enlarged vertical cross section through the drink receptacle or can showing th agitator element attached thereto.' 5 60 FigurelZi isa fragmentary plan view of the structure in Figure '11 -showing'the connection between receptacle and agitator element inhorizontal cross section.- 'I' I Referring now with 'more particularityto the 65 drawings the reference character 1 designates generally a motor housing comprising the annular center ring 2-andvthe4 substantially hemispherical or rounded upper and lower ends 3 and 4f-joined to thel ring 2 along the lines 5 by screws 6. The 70 lower'end 4 has a reduced and downwardlyvextended hollow neck '7. The housing 1 thus formed is adapted tobe mounted on a stand 8 which has a fork 9 at its upper end forming spaced-arms 10 adapted to embrace the said housing and having trunnions -11 at their 1 ends pivotally seated `in bearings 12 formed Ain `the lower housing .end'4 just belowV the lower parting line 5 of 'the housing'. The stand 8 ssecured to orformed'integrally with a base 13 and is supported thereons: The housing 30 1 may thus be swung outward at its lower rend, this movement being limitedin its outward ex'- tent by a stop v14 cast on .the lower erid` 4 and adapted' to strike the :junction V1510i the stand arms 10 as will be understood-inlFigure 2. l

An outer drive' shell 'or' vsleeve 16'v is disposed vertically' and centrally'in the'ihousing '1- 'andfis journaled therein at its lower end by reducing this end at 17-vand forming anangularfball raceo rest lrunning-"on ball 'bearings 19 heldinfthe4 90' neck 7 by a race 20 threaded at 21 in thev said neck: and locked by 'a lock ring'k 22. The upper end'of the shell 16 terminates short of thesquare'd or nat inner face 23 'of the upper housing end 3 and faV cap 24 is secured by screws 25 to this upper-end 95 of the shell and extends into a recess 26 cut in said end4 face 23,1 the top'27 of the cap 'having an-an. nular and angular bearing race 28 :rolling onball bearings 29 vheld ini place byan'angular race 3,0 cut in the housing end as shown.'v The drive sleeve 100 16 is thus journaled freely lin the housing' and the armature AY ofthe electric motor B is secured directly .to or built upon this sleeve, lthe field coils C vbeingithen disposed around and' within the center housing .ring l2. The V'armature as it rotateswill 105 thusof 'course rotate the drive sleeve 16 in'vit's bearings.

An aperturelis formed in one side-of the cap 24 near its top V27 and a portion of the Vsidegv'vajll of Vthls 'capbelow this aperture is bent Vinwarzll'y 1110 to form a mounting ear 32. A drive pinion having a large toothed gear 33 and smaller gear 34 beneath is mounted in the aperture 31 and is journaled therein by a pin 35 passed through the top 5 27 of the cap down into the ear 32. An internal vzo gear v36 is secured by screws 37 to the cap end 3 concentric with the drive sleeve 16 and is meshed with the large gear 33 of the drive pinion whereby said pinion -wi'llbe rotated as it is carried around the internal gears bythe rotating drive sleeve.

lAn' agitator operating sleeve 38 considerably smaller in diameter than the drive sleeve 16 is journaled concentrically therein by upper and lower ball bearings 39 and 40, the upper bearhigs 39 running in a race 41 on the sleeve 38 and a race 42 threaded at 43 in the upper endqoftliefsleeve 16 and locked by a lockrring N44 and the lower bearings running in fixed rows 45 and 46 formed ron the outer face of the sleeve 38 andzthezfinner face of the sleeve 16 respectively. It will be noted ihatyall thesbearmgsglzzzl; '39 and 4:0 areiadapted to act both as radial :..and1-thrustbearings The agitator;.operatngtsleeveg'38extends to the lower :endsof-.drive1-sleeve rvlfieat its; lower. end and extends at its upperfend intothe sanz-24am hasgear fteeth :47 f formed aroundzitszupper; end .mesh-ing y mthfzthesmallerggeareof .thealdrive pinion. 7ilhe slvex :hassreversef or;l double spiral-grooves or threads 48 cut in its inner Wolltwhich terminate :short f of its upper and lower .endsf and conventionalreversingcollars 49;;arethreaded atiG these-ends; the curved; or vconcaved inner` ends `,5;1 of these 'collars 'falling :just short .of the g end grooves fora .conventional purpose las will -bo minted out. f P

carrier guide .tube-f5.2 is provided andisfof such-diameter as tozitfreely' andinicelyinto the 1-loo.re.ofthe; agitator :operatingzsleeve: 3.8` wherein it:isimounted,vthefsaidtube having -a closed: ad flangedupperl end 53...overlying theanpner end -of thenpper reversing coliar 'e1-awhile its lowerfend terminatesrush-;with the lowerzend ofthesieeve A squared 'operating 1 stub forstem ,155 is :textendedaupwardly .fromthe endoS I of :the tube-,5..2 an'dnasses .through ;a square ropenins .1.5.6 formed imthe-:closed endfrfZ'--ofnthefzfcap :2.4 and thence freelwupwardthrough.anzaperture ,157, inthehousingi end1f31andis: provided outwardlyreof thisrhousneumtica rigidlyz'mounted iknobi. .An-:expone sion coil spring 1.5.9:is'polled:around thegstem 55 andnbraced between-,thetubezend 53 and thetcap end .'27 so fasi .tofhold .the tubefZ. downwam i nthe sleever.- The .carrier guide-ztubehZ has longe tudinahand '.'diametrical-ly vopposed slots .60 eX- tended substantiallyrirom.-endttoezendfibutterminatinggohortsof :its uonernand lower. .ends asshown.

. outside-.the tube 52ans .arrangedtoplay in the spiralg-groovfcssein thegsleeve. To facilitate their, movement throughthegrooves.48. the wings 62 Lare of @arcuate .form and: taper: toward -xtheir ends-asshow -atf6;5 :.'Iheoarrier `Alhasathreaded -..s9ket 6 6Y i formed 3 in its 1 Vlower gend in *.'which Y may be goor-owed @theI upperfpthreaded fend .167 .of

thestem 68,` of a conventional agitatorftt.'V Y Y; sinthe: operation of thefstructurefso f arrecited andassi-mung that theaeitator stem E68 is thread:

afd-in theesocket 66 kin its carrier .i 61, the i motor r16 but at a diiferent speed due to the ratio of the gears. Atthe same time the carrier guide tube-52his -driven-directly-by` and in the same direction as the drive sleeve 16 by the square stem 55 and so rotates rapidly Within the sleeve 381m the same direction. Further assuming that initial-.1y the agitator carrier 6l is at the bottom of the tube 52 this dierence in the speed of roltation--of thetube 52 and sleeve 38 will rotate thecarrier andoffcourse the agitator 69 and at 'the Sametime the pawls 62 Will climb in the grooves-148 in the sleeve A38 carrying the carrier and agitator slowly upward in the tube 52. When the- Acarrier 161- reaches the` upper end-ofthe tube 52 the -pawls 162 will strikev` the upper reversing collar-249 whose concaved end 51wwill then vdirect the pawls downward intoV the grooves 48 so Vthat the carrier will move back'downthroughzthe guide tube. fAs theoarrierjreac'hes the lowerr extremity ofits trave'lthejpawls 62 7will engage thelower reversing-collar 49 and will be directed,thereby back up lthroughy the-grooves I48 Vas `w-ill ibe yreadily understood. This operation will be continued-as long asr the motor runs. -"It vwill bev noted that the agitatorf69 tis thuslrotatedrin the same direction and at the same speedas the -motor 13,thedirection of rotationoffthe agitator being-clockwise as viewed' from the top and-as shown by the arrow in 4figurey 12. As shown infligure's` 1, A11 and`fl2 the agitator 69 ispermanently-androtatably attached to the `mixing -canor-oontainer-'7O by passing the -stem '68"throughjabearing, block 71 supported bya bracket 72 the uppereend of t-he can Iand -near the-;rnargi r1`thereof. "This bearing block k71"'has avertical bore 'T3-extended'inparallelism with the vertical axis of thecan 70 throughwhich said vstern 68is;slidably andfrotatablygrnounted and a locking 'device-is providedto :lock the stern againstl rotation ,in the opposite directionv toits norznal'movementwhen drivenl by, the`--rnotor B. Thisv locking device comprises Y oppositetortuous passages' i74 extended horizontally intothe"bear ing block "71 and at their inner ends A'curving around and inward -toward YandUmor-ging y,with thelbore 73r therein. f' These innercurved ends 75 are directed a counterclockwise direction as viewed'from the top in Figurer12 .and ,oppositely tothe normal clockwise direction of. rotation of the. stem 68.` Locking halls 76 are disposed inthe passagesfii and are normallyorcedinwardly therein by ,expansion coil` springs 77:*h`e1d` inthe passages Aby threaded plugs 78. As the stern V68 rotatesin its. normal clockwise direction the-flockingballs 76 will be forced outwardin thewpassages 7 4 allowingthe stem to rotate freely but in the opposite direction' the balls will vbev forced inward andzja-mrned againstjthe stern frictionally locking or ret'ardipg it against rotation? as will pounderstood. The agitator sternfmay thus be unscrewed from the carrier 61 byturning'the'fknob 58 in a counter-clockwise direction. The can-70 'has a portion oi"Y its upper margin ormedinv/ardly adjacentfthebearing block 7l'at 79 and 'has an arcuate hanger strip or bar 80 disposedover this port-ionsso-z that'tfhefcan 'mayjbe supported onthe standlrfby slip'ping'fthis stripf80over. the hook 15orv '81 on the stand. Near its lower end the can 70 then rests against and in an arcuate supporting bracket 82 on the stand. f

The agitatorl stem 68 passes through and between ball bearings 83 arrangedin a tapered end piece or cap 84 threaded at 85a in the lower end of the outer drive sleeve 16 asshownf.

To control the motor B and shut it oil after a predetermined time I provide a control switch now to be described. A switch operating cage or frame is provided comprising a cylindrical member 85 slidably mounted in the lower end of the carrier guide tube 52 around the agitator stem 68 and so disposed that each time the agitator carrier 61 moves to the lower end of the tube 52 it will strike this member 85 and force it downwardly for some distance. Three equally spaced arms 86 are extended from thelower and outwardly iiared end 87 of the member 85 and extend upward along side the carrier operating sleeve 38 for some distance and then flare angularly outward at their ends 88 and pass loosely through angular slots 89 cut in the walls of the outer drivev sleeve 16. A ring 90 is rotatably and slidably mounted around the sleeve 16 by ball bearings 91 and these upper flared ends 88 of the arms 86 are secured to this ring by screws 92. The arrangement is such that the aforesaid downward movement of the member 85 will be transmitted to the ring 90 causing it to move downward on the sleeve 6. The ring 90 is normally urged upward and held by an expansion coil spring 93 coiled around the sleeve 16 and braced between said ring and a collar 94 xed on the sleeve beneath. l

A circular switch operating cam 95 having four equally spaced radially projecting lugs 96 isrotatably mounted by a pin 97'on a bearing post 98 extended inwardly from the lower end 4 of the motor housing 1 and a ratchet wheel 99 is formed on or secured to the face` of this cam to rotate therewith. An arm 100 is pivotally attached by one end to the pin 97 and extends outward along the face of the ratchet wheel 99 and then is bent and extended inwardly toward the ring 90 on the sleeve 16, said arm terminating in a U-shaped fork 101 having ball bearings 102 in its spaced legs 103 which are adapted to'embr'ace or straddle the horizontal. ange 104 of said ringv 90. The arm 100 carries a dog 105 with a conventional spring 106 holding it normally in engagement with the teeth 107 of the ratchet wheel 99.Y .y v

One of the trunnions 11 in the stand arms 10 has a square extension 108 on which .is rigidly aixed a crank arm 109 having a pin 110 in its lower end. A lever 111 is pivoted at one end 112 to a bearing 113 on the housing end 4`and passes beneath the said extension 108 and has a pin 114 in its free end. Intermediate its ends the lever 111 has'an angularly extended slot 115v in which the pin von the crank arm 109 plays and the arrangement is such that the inward movement of the lower end of the motorhousing 1in the stand 8 after it has been swung out to insert the agitator stem will cause said lever 111 to move upward at its free end by the cam-likdaction of the pin 110 in theslot 115. A motor starting arm 116 is pivotally mountedr at one'end on-the pin 97 and extends radially. outward across the face of the ratchet wheel 99 in direction opposite to the arm 100 and at its free end is bent inwardly and forked at 1'1'7 to engage the `pinr1l4 at the end of the lever 111. This arm 116 also has a conventional dog.118 and spring 119 holding the dog inengagementwith the ratchetwheel teeth 107. Y 1

A switch lever 1207is pivoted at its upper end at 12-1 to an' arm 122 Vextended inwardly from the motor housing 1 and passes downward alongside the periphery of the switch operating cam 95 and is held in engagement therewith byka retractile coil spring 123 arranged as shown. At its lower end the lever 120 engages a flexible switch con'- tact 124 mounted on an insulating block125 secured in themotor housing and the spring 123 normally causes said llever 120 to force this contact 124 into electrical engagement with the xed contact 126. The wires127 leading to the motor B are trained up through the stand 8 and the passage 128 in the hollow arm 10y and vthence through a bore 129 in the trunnion after which one wire 127e goes to thelswit'ch contacts 124 and 126 and thence to the motor B in well known manner so that said switch contacts open and close'the circuit to the motor.

The operation of the machine as a whole will now be described.y With'the switch parts in the positions shown in the drawings and assuming that the agitator carrier 61 is at the lower end of its guide tube 52 the elements of the drink to be mixed Yare placed in the can 70 and the motoi` housing 1 is swung outward at its lower end and the agitator stem 68 is projected up into the housing until its threaded end 67 meets the socket 68 inthe carrier. The return movement or swingof the motor housing moves the free endrof the lever 111 'upward as aforesaid and so the starting arm 116 is swung upward causing the dog 118 thereon to rotate the ratchet wheel 99 in a clockwise direction as `indicated in Figure 4 a distance equal to one'tooth 107. At the same'time'the cam 95 is rotated a short distance moving the lug 96 from engagement with the switch lever 120 and allowing the spring 123 to pull said lever over and force the switch contact 124`into engagement with the contact 126 closing' the circuit and starting the r is rotated then moves upward through the tube 52 as aforesaid to the upper end and then back to the lower end 'and' asl it reaches the lower end it strikes the member 85 pulling the ring `90down on the drive sleeve 15; This action is transmitted to the lever 100 and the dog 105 thereon is caused to rotate the wheel 99 and cam 95 in a clockwise direction a distance equal to one tooth 107. The upward and downward travel of the agitator carrier 61 is then repeatedY and the wheel 99 and cam 95 moved one tooth for each'operation. yIn the embodiment here shown the ratchet wheel 99 has twelve teeth and upon the third downward movement of the carrier 61 the resulting movement of the wheel 99 and cam 95- will bring the next lug 96a into engagement with the switch -rflever 120 and will force the same outward freeing the switch 'contact 12.4 andjopening the circuit to the motor B.- The parts-arethen again inthe position shown herein and the agitator stein 88 l l may be released by turning the knob 58 as-afore Y:

, While I have herein .set forth 'afcertain preferred embodiment of my invention it is understood that I-mayvary from the *same in minor structural details so as best to construct a' practical device for the purposes intended, not departing from the spirit of the invention and within the scopeof the appended claims.

l. In a device of the kind described, a stand, a housing pivoted in the stand'a motor in the housing, an agitator carrier mounted in the housing, means for connecting an agitator to the agitator carrier, means for rotating the said carrier in the housing, and means for simultaneously and vertically Vreciprocating Vthe agitator carrier in the housing, and a. motor control switch operable by movement or the housing in the stand to close the circuit tothe motor and operableby the reciprocation of the agitator carrierto open the circuit to the motor after a predetermined time.

2. In a device ofthe kind described, a housing, a motor in the housing, an agitator carrier mounted in the housing, means for connecting a drink agitator to the agitator carrier, means connecting the motor and agitator carrier for simultaneously rotating and reciprocating the latter, a control switch for i the motor,` manually operated means for closingthe said control switch, automatically operated means tor opening the,I said control switch after a predetermined number of movements of these-id agitator carrier, and means for disconnecting the drinkagitator from the agitator carrier.

3. Ina device of the kind described, a motor vhousing,'a motorin the housing'a drive sleeve driven by the mo-tor, a guide tube driven by the drive sleeve, an operating sleeve mounted between the drive sleeve and guide tube, means for driving the operatingsleeve in the same direction as the :motor but at a' different speed, the said operating sleeve having reverse spiral grooves, a carrier'slidably mounted-in the guide tube, pawls on the said carrier playing in the grooves in the operating sleeve, and an agitator detachably conneet-ed to the carrier. 1

4; In a device of thekind described, a motor housing, a motor in the housing, a drive sleeve riven by the motor, a guidetube, means for driving the guide tube fromthe drive lsleeve and at a different speed, an operating sleeve mounted between the drive sleeve and guide tube, means for driving the operating sleeve in the same direction as the motor but at a different speed, the said operating sleeve having reverse spiral grooves, a

carrier slidably mounted in the guide tube, pawls on the said carrier playing in the grooves in the operating sleeve, and an agitator detachably connected to the carrier, and a switch operated by the carrier to open the circuit to the motor after a predetermined period.

5, In a device of the-kind described, a motor housing, a motorv in the housing, a drive sleeve and guide tube rotated by the motor, an' operating havingA reverse spiral grooves, Vmeans for rotating the operating sleeve in the same direction as that of the vdrive sleeve and guide tube but at a different speed, an agitator carrier f slidably mounted in the guide tube, pawlson the ksaid carrier playing in the said grooves in the operating sleeve whereby the said carrier willY travel from top to bottom in the guidetube, a "motor control switch for the motor, and means operable by the said agitator carrierwhereby vsaid switch will'be' opened after a predetermined number of upward and downward Vmovements of the carrier in the-guide tube. g

6. In a device of the kind described, a stand, a-motor housing pivotallymounted in the stand to swing.- outward therein, a motor in the housing, a drivesleeve, aguide tube mounted concentrically inthe drivev sleeve, an operating sleeve around the guide tuba-meansfor rotating the drive'sleeve, guide tube, .and operating sleeve in the same directionbutat differentspeeds, the said guide tube having longitudinalslets andthe operating sleevehaving reverse-spiral grooves vin its.`.inner surface, an agitator. carrier'v slidably mountedin the. guide tube,.pawls adapted to play inthe -said spiral grooves and includingstems slidablymounted through the. slots in the guide tube. andv connected vto the said agitator carrier', thev said agitator carrierhaving means for connection to an agitator. y

' 7. In a deviceof the kind described, .a stand, a motor, housing pivotally mountedin the. standto swing outward therein, amotor in the housing, a drive sleeve, .a guidetube mountedconcentrically.4 iny thefdrive sleeve, an operating .sleeve around ,theguide tube,.means .for=rotating the drivesleeve,-guide tube and operatingsleeve in thesame direction butsat dierent speedagthe said .guide tube having longitudinal slots and the operating sleevehaving, reverse spiral grooves in its inner surface,..an..agitatcr .carrier slidably mounted in vtheguide tube, pawls .adapted to play in said. spiral grooves and including .stems slidably mounted throughtheslots in the guide tube .and connected to .thesaid agitator carrier, the

said agitator carrierhaving vmeansfor connecting to an agitator, a motor control switch 'for the motor, operating ,means for the motor Vcontrol switch whereby the same willY belclosed.. as the motor housing is swung inward in the stand, and openedafterthe agitator carrierhasoperated for a predetermined period.

..8.-.In a device ofthe kinddescribed, a. housing,

a .motor mounted inthehousing, a drive sleeve ,l

journaled inthe housing, and connected rto the motor, a guide tube. mounted concentrically in the drive ,sleeve and. connected thereto, an agitator carrier. .slidably mounted in the. guide V.tube and arranged to4 rotate therewith, means. for. Ireciprocatingthesaid agitator carrier inthe guide. tube, a` tubular ,member slidably Vmounted in one end of the guide.tubeandadaptedito kbe 'forced outward therein by. theagitator carrier as it vreaches theend of theguide tube, aringslidablymounted on the .drive tube, arms `connecting .the Isaid-,tubular member and ring, a cam, ajratchet wheel connected tothe cam, an arm pivoted on theratchet wheel a dog on ther arm, in engagementwith the teeth of the ratchet-wheel, a fork on thefree end of the arm engaging thesaid ring onthe .drive` tube,spacedswitchcontacts, a switch lever spring set. tonormally closeV the .said `switch vcontacts and bear against theperipheryof the cam, Aand manually operated.meansY for Amoving the .said switch lever out.of Y.engagement Withthe said switch contacts.H A .Y y

v 9. In a deviceof theY kind described, a housing, a motor in the housing, a drive sleevel journaled in the housing throughthe motor and Vdriven thereby, a guide sleeveA mounted concentrically within the'drive sleeve and connected thereto at one end the said guide sleeve having longitudinal slots, an'operating sleeve journaled between 'the drive and guide sleeves, the said Yoperatingsleeve having reverse spiral grooves in its innerface gears connecting'the Idrive sleeve and operating iso its

sleeve whereby the latter is driven in the same direction as the former but at a diierent speed, an agitator carrier slidably mounted Within the guide sleeve and guide means extended from said agitator carrier through the slots in the guide sleeve and into the grooves in the operating sleeve whereby the carrier Will be reciprocated in the guide sleeve by the diierential rotation of the operating sleeve.

10. In a device of the kind described, a motor housing, a motor therein, an agitator carrier mounted in the housing and reciprocated therein by the motor, a motor control switch, a cam for operating the said control switch, a ratchet Wheel on the cam, an arm for operating the said ratchet Wheel, and an actuating member disposed in the path of the agitator carrier and connected to the arm whereby said motor control switch will be opened to stop the motor after a period of reciprocation of the said agitator carrier.

11. In a device of the kind described, a housing, a motor in the housing, a guide sleeve rotated by the motor, an agitator carrier mounted on the sleeve for rotation thereby in one direction, means for manually rotating the said sleeve and carrier in the opposite direction, the said agitator carrier having a threaded socket, a container, an agitator in the container including a threaded stem adapted to be screwed into the said agitator by the rotation of the motor or unscrewed by manual rotation of the carrier and guide tube, and means on the container for locking the said agitator stem against rotation While it is unscrewed from the agitator carrier.

12. In a device of the kind described, a housing, a motor in the housing, a guide sleeve rotated -by the motor, an agitator carrier mounted on the sleeve for rotation thereby in one direction, means for manually rotating the said sleeve and carrier in the opposite direction, the said agitator carrier having a threaded socket, a container, an agitator in the container including a threaded stem adapted to be screwed into the said agitator by the rotation of the motor or unscrewed by manual rotation of the carrier and guide tube, and means on the container for locking the said agitatorstem against rotation while it is unscrewed from to move into wedging contact with the agitator stem while the agitator carrier is released therefrom.

HOWARD W. MILLER. 

